RADIO FREQUENCY POWER AMPLIFIER
First Claim
1. A radio frequency power amplifier for power amplification of radio frequency signal, comprising:
- a plurality of transistors connected in parallel and each having a grounded emitter;
a plurality of first resistors each having a first terminal and a second terminal, wherein a direct current bias voltage is commonly applied to all of the first terminals, and the second terminals are connected to bases of the respective transistors;
a plurality of first capacitors each having a first electrode and a second electrode, wherein the radio frequency signal is input to all of the first electrodes, and the second electrodes are connected to the bases of the respective transistors; and
one or more impedance circuits each having a first terminal and a second terminal, wherein the direct current bias voltage is commonly applied to all of the first terminals, and the second terminals are connected to collectors of the respective transistors,wherein the impedance circuit conducts a direct-current component.
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Accused Products
Abstract
A radio frequency signal is input to the bases of transistors via respective capacitors, is amplified, and is output from the collectors of the transistors. The emitter of each transistor is grounded. A bias current input from a bias circuit is supplied to the bases of the transistors via respective resistors both during low-output operation and during high-output operation. The collectors of the transistors are connected via an impedance circuit to a bias voltage input terminal. Therefore, during high-output operation, a direct current offset voltage is generated by the impedance circuit based on a portion of a radio frequency signal output from the collectors, thereby further increasing the bias current.
57 Citations
13 Claims
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1. A radio frequency power amplifier for power amplification of radio frequency signal, comprising:
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a plurality of transistors connected in parallel and each having a grounded emitter; a plurality of first resistors each having a first terminal and a second terminal, wherein a direct current bias voltage is commonly applied to all of the first terminals, and the second terminals are connected to bases of the respective transistors; a plurality of first capacitors each having a first electrode and a second electrode, wherein the radio frequency signal is input to all of the first electrodes, and the second electrodes are connected to the bases of the respective transistors; and one or more impedance circuits each having a first terminal and a second terminal, wherein the direct current bias voltage is commonly applied to all of the first terminals, and the second terminals are connected to collectors of the respective transistors, wherein the impedance circuit conducts a direct-current component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification